Lenovo VIBE X S960 IdeaPhone 5" 1080P 13MP Quad-Core Unlocked Smartphone Phone Lenovo VIBE X S960 IdeaPhone 5" 1080P 13MP Quad-Core Unlocked Smartphone Phone CPU: MTK MT6589T Quad-core 1.5 GHz Memory: RAM 2GB , ROM 16GB Screen: 5.0 inches 1080p FHD IPS 1080 x 1920 pixels, 13 MP/ Auto Focus , LED flash Other: Android OS, v4.2 (Jelly Bean) , battery 2050 mAh Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.